The incident, according to Mr Wanjama, happened between 3am and 4.30 am.

The
four were in the same car as another one with family members, including
the wife and a daughter of the MP, followed from behind.

Occupants
of the second vehicle said the MP stopped at the roundabout when four
people with big guns approached his car and started shooting.

"They
just started spraying it with bullets. When we saw that, our driver
sped past the other car and when we came back to the scene a few minutes
later, all the occupants of the vehicle were dead," the relative told
detectives at the scene.

A newspaper vendor who witnessed the shooting told the police that one of the gunmen who led the shooting had a facemask.

The bodies of the four had bullet wounds in the head and chest.

They were taken to the Lee Funeral home at 6.30am.

THOROUGH INVESTIGATION

Legislators
who arrived at the Lee Funeral Home asked the government to do a
thorough investigation into the killing, saying it would be easy to get
the murderers as the scene of the crime is under the surveillance of
CCTV cameras.

Kiambu Senator Kimani Wamatangi said Mr Muchai had been threatened several times and had reported the threats to the police.

"The
CCTV clips should be handed to the detectives as soon as possible.
There is no way the perpetrators will not be known" he said.

Nairobi
Senator Mike Sonko, who also arrived at the crime scene, asked the
government to take the safety of legislators in the country seriously.